Mercury 4.5 (1 CYL.) (9258281 & Up) Parts & Diagrams

OEM and aftermarket replacement parts for Mercury 4.5 (1 CYL.). Scroll down for exploded parts diagrams (18), specifications, and maintenance reference.

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06211-ZY5-505 Maintenance Kit for Honda BF135A BF150A | JLM Marine
06211-ZY5-505 Maintenance Kit for Honda BF135A BF150A | JLM Marine
$82.50
$82.50
files/kit-23KH761-4N.pngDefault Title
$82.50
06211-ZW5-505 Maintenance Kit for Honda BF115A BF130A | JLM Marine
06211-ZW5-505 Maintenance Kit for Honda BF115A BF130A | JLM Marine
$82.50
$82.50
files/kit-23KH760-4N.pngDefault Title
$82.50
06211-ZW0-505 Maintenance Kit for Honda BF75A BF90A | JLM Marine
06211-ZW0-505 Maintenance Kit for Honda BF75A BF90A | JLM Marine
$71.50
$71.50
files/kit-23KH758-4N.pngDefault Title
$71.50
Water Pump Impeller – Fits Mercury/Mariner 3.5–9.8 HP (Replaces 47 - 89980, 47 - 68988) - JLM Marine Boat Parts Limited
Impulsor de bomba de agua para Mercury 3.5 3.6 4 4.5 7.5 9.8 HP 47-89980
$7.99
$7.99
files/Water_Pump_Impeller_for_Mercury_35_36_4_45_75_98_HP_47-89980_-_JLM_MARINE-8288504.jpgDefault Title
$7.99

Mercury 4.5 (1 CYL.) (9258281 & Up) Parts & Diagrams

🔎 Mercury 4.5 (1 CYL.) Reference Library — Exploded parts diagrams (18 diagrams), specifications, common issues, and maintenance checklist.

The Mercury 4.5 (1 CYL.) is a 4-Stroke, 1-Cylinder outboard motor. Designed for dinghies, inflatable boats, and small tenders where lightweight portability is essential.

Quick Reference Specifications

Specification Value
Engine Type 4-Stroke, 1-Cylinder
Horsepower 4 HP
Displacement 123 cc
Bore x Stroke 59 mm x 45 mm
Spark Plug (Type & Gap) NGK DPR6EA-9
Engine Oil Capacity 0.45 L (15 fl oz)
Recommended Engine Oil SAE 10W-30 Mercury 4-Stroke Outboard Oil
Gear Case Oil Capacity 189 mL (6 fl oz)
Idle Speed (in gear) 1100 RPM (in gear)
Full Throttle RPM Range 4500-5500
Fuel Unleaded Gasoline, 87 Octane min.

Always verify specifications against your owner's manual for your specific serial number range.

Common Issues & Recommended Parts

Below are common maintenance scenarios for the Mercury 4.5 (1 CYL.):

  • Water Pump / Overheating: If the tell-tale stream is weak or absent, the water pump impeller likely needs replacement. Inspect annually or every 100 hours. → Recommended: Water Pump Impeller Kit
  • Engine Oil / Maintenance Light: 4-stroke engines require regular oil and filter changes. Use marine-grade oil rated for your engine. Change every 100 hours or annually. → Recommended: Oil Filter, Engine Oil
  • Fuel Injector Issues (EFI models): Rough idle or misfires may indicate clogged fuel injectors. Use fuel stabilizer and clean injectors periodically. → Recommended: Fuel Injector, Fuel Filter
  • Gear Case Oil Leak: Check lower unit seals if gear oil appears milky (water contamination). Replace seals and gaskets during lower unit service. → Recommended: Lower Unit Seal Kit, Drain Plug Gaskets
  • Anode Corrosion: Inspect sacrificial anodes regularly, especially in saltwater. Replace when 50% depleted to protect against galvanic corrosion. → Recommended: Zinc/Aluminum Anode Kit

Parts Diagrams & OEM Part Numbers

Expand the sections below to view detailed exploded parts diagrams and find the exact OEM replacement components for your Mercury 4.5 (1 CYL.).

▶BOTTOM COWL ASSEMBLY (27 parts) BOTTOM COWL ASSEMBLY
Ref OEM Part # Part Name
- 27-78139A80 GASKET SET
1 187-7711A4 BOTTOM COWL
2 36187A1 LEVER ASSEMBLY, CLAMPING - PORT
3 36188A1 LEVER ASSEMBLY, CLAMPING - STARBOARD
4 53-55891 FASTENER, CLAMPING LEVER
5 84-60871A7 STRAP ASSEMBLY, Ground
6 24-63399 SPRING, GROUNG STRAP
7 23-26819 BUSHING, NYLON - CLAMPING LEVER
8 23-31293 BUSHING, RUBBER - CLAMPING LEVER
9 17-58997 PIN, Roll (.164 x .750), CLAMPING LEVER
10 10-79953Q04 SCREW, (.375-16 x .250), BOTTOM COWL FLUSHING HOLE
11 12-191833 WASHER, BOTTOM COWL FLUSHING HOLE SCREW
12 56712 NOZZLE, TELL TALE
13 10-35519 SCREW, (#10-16 x .500), TELL TALE NOZZLE TO BOTTOM COWL
14 32-8M0108355 HOSE, TELL TALE (7-1/4")
15 22-996642 ELBOW, TELL TALE - HOSE TO CYLINDER BLOCK
16 27-89937 GASKET
17 27-55847 GASKET
18 55936 COVER, EXHAUST RELIEF
19 10-69079 SCREW, (#10-16 x .440)
20 87-69508A31 SWITCH ASSEMBLY, Stop Comment: PUSH BUTTON SWITCH
21 87-99525A1 COVER ASSEMBLY Comment: PUSH BUTTON SWITCH
22 13-69845 LOCKWASHER Comment: PUSH BUTTON SWITCH
23 11-69844 NUT, STOP SWITCH Comment: PUSH BUTTON SWITCH
24 87-11083A9 SWITCH ASSEMBLY, Stop Comment: TOGGLE SWITCH
25 8M0032846 RETANER Comment: TOGGLE SWITCH
26 15920Q54 LANYARD ASSEMBLY Comment: TOGGLE SWITCH
▶CARBURETOR ASSEMBLY(TILLOTSON) (40 parts) CARBURETOR ASSEMBLY(TILLOTSON)
Ref OEM Part # Part Name
- 1395-92621 REPAIR PARTS KIT
1 1341-8740A1 CARBURETOR ASSEMBLY, COMPLETE
2 1395-8673 FLOAT ASSEMBLY
3 NSS NOT SOLD SEPARATE, Pin-Float Lever Pinion
4 NSS NOT SOLD SEPARATE, Float Lever-Lower
5 NSS NOT SOLD SEPARATE, Float Lever-Upper
6 1395-92581 NEEDLE/SEAT KIT, Inlet, SEAT AND GASKET
7 NSS NOT SOLD SEPARATE, Gasket-Inlet Seat
8 NSS NOT SOLD SEPARATE, Gasket-Float Bowl Cover
9 1399-1133 COVER, FLOAT BOWL
10 10-52195 SCREW, FLOAT BOWL (SHORT)
11 10-52196 SCREW, FLOAT BOWL COVER (LONG)
12 8,13-26995 LOCKWASHER, Stainless Steel, FLOAT BOWL COVER SCREW
13 NSS NOT SOLD SEPARATE, Gasket-Strainer cover (Large)
14 1399-3938 SCREEN, FILTER
15 NSS NOT SOLD SEPARATE, Gasket, Strainer cover (Small)
16 1399-1135 COVER, STRAINER (90 DEGREES)
17 NSS NOT SOLD SEPARATE, Gasket, Strainer cover Screw
18 10-25822 SCREW, STRAINER COVER
19 1395-6027 SCREW, THROTTLE STOP LEVER
20 8146791 LEVER, THROTTLE STOP
21 1399-1716 SHAFT
22 NSS NOT SOLD SEPARATE, Idle Tube
23 NSS NOT SOLD SEPARATE, Gasket, Idle tube
24 NSS NOT SOLD SEPARATE, Screw-throttle Shutter
25 1399-3739 SHUTTER
26 NSS NOT SOLD SEPARATE, Welch Plug, Body Channel
27 NSS NOT SOLD SEPARATE, Spring, throttle shaft return
28 10-28845 SCREW, PLUG-BODY CHANNEL
29 NSS NOT SOLD SEPARATE, Main Nozzle
30 10-23178 SCREW, PLUG-MAIN NOZZLE
31 1399-1896 JET, MAIN FUEL (.041)
32 NSS NOT SOLD SEPARATE, Gasket-Main Fuel Jet
33 NSS NOT SOLD SEPARATE, Gasket, Jet Channel Plug Screw
34 10-28405 SCREW, PLUG-MAIN FUEL JET CHANNEL
35 1399-3740 SCREW, IDLE ADJUSTMENT
36 NSS NOT SOLD SEPARATE, Spring, Idle Adjustment Screw
37 27-63309 GASKET, CARBURETOR TO REED BLOCK
38 12-20583 WASHER, CARBURETOR MOUNTING STUD
39 11-24652 NUT, (.250-28), CARBURETOR MOUNTING STUD
▶CARBURETOR ASSEMBLY(WALBRO) (37 parts) CARBURETOR ASSEMBLY(WALBRO)
Ref OEM Part # Part Name
- 1395-9019 REPAIR PARTS KIT
1 1341-8740A1 CARBURETOR, COMPLETE
2 1395-8673 FLOAT ASSEMBLY
3 NSS NOT SOLD SEPARATE, Pin, float lever pinion
4 NSS NOT SOLD SEPARATE, Lever, float (Lower)
5 NSS NOT SOLD SEPARATE, Lever, float (Upper)
6 1395-83181 NEEDLE, Inlet, SEAT AND GASKET
7 NSS NOT SOLD SEPARATE, Gasket, inlet seat
8 NSS NOT SOLD SEPARATE, Gasket, float bowl cover
9 1399-1133 COVER, FLOAT BOWL
10 10-52195 SCREW, FLOAT BOWL COVER (SHORT)
11 10-52196 SCREW, FLOAT BOWL COVER (LARGE)
13 NSS NOT SOLD SEPARATE, Gasket, strainer cover (Large)
14 1399-3938 SCREEN, FILTER
15 NSS NOT SOLD SEPARATE, Screen, filter
16 1399-1135 COVER, STRAINER (90 DEGREE)
17 NSS NOT SOLD SEPARATE, Gasket, strainer cover screw
18 10-25822 SCREW, STRAINER COVER
19 1395-6027 SCREW, THROTTLE STOP LEVER
20 8146791 LEVER, THROTTLE STOP
21 1399-1716 SHAFT
22 NSS NOT SOLD SEPARATE, Idle Tube
23 NSS NOT SOLD SEPARATE, Gasket, idle tube
24 NSS NOT SOLD SEPARATE, Screw, throttle shutter
25 1399-3739 SHUTTER
26 NSS NOT SOLD SEPARATE, Welch Plug, body channel
27 NSS NOT SOLD SEPARATE, Spring, throttle shaft return
28 NSS NOT SOLD SEPARATE, Screw, plug - body channel
30 NSS NOT SOLD SEPARATE, Screw, plug - main nozzle
31 1399-1896 JET, MAIN FUEL (.041)
33 NSS NOT SOLD SEPARATE, Gasket, jet channel plug screw
34 NSS NOT SOLD SEPARATE, Screw, plug - main fuel jet channel
35 1399-3740 SCREW, IDLE ADJUSTMENT
36 NSS NOT SOLD SEPARATE, Spring, idle adjustment screw
37 27-63309 GASKET, CARBURETOR TO REED BLOCK
38 12-20583 WASHER, CARBURETOR MOUNTING STUD
39 11-24652 NUT, (.250-28), CARBURETOR MOUNTING STUD
▶CARBURETOR CHOKE LINKAGE (9 parts) CARBURETOR CHOKE LINKAGE
Ref OEM Part # Part Name
1 59000 LEVER, Throttle
2 10-20597 SCREW, (#8-32 x .380)
3 79092 SHUTTER AND SCREEN, CHOKE - CARBURETOR
4 24-53193 SPRING, CHOKE SHUTTER TO LEVER
5 24-55299A1 SPRING ASSEMBLY, CARBURETOR
6 10-55298 SCREW, (#10-32 x .580), SPRING TO CARBURETOR
7 53187 LEVER
8 24-53190 SPRING, TENSION - CHOKE KNOB
9 53189 KNOB
▶CLAMP BRACKET ASSEMBLY (18 parts) CLAMP BRACKET ASSEMBLY
Ref OEM Part # Part Name
1 1468-5570A3 CLAMP BRACKET ASSEMBLY (PORT)
2 1467-5571A3 CLAMP BRACKET ASSEMBLY (STARBOARD)
3 10-77190A3 THUMB SCREW ASSEMBLY
4 10-768042 SCREW, THUMB SCREW
5 12-73719 WASHER, THUMB SCREW
6 12-71421 WASHER, Nylon, TILT TUBE - CLAMP TO SWIVEL BRACKET
7 96962 TILT TUBE, CLAMP TO SWIVEL BRACKET
8 19-39333 PLUG, TILT TUBE
9 11-93164 NUT, (.875), TILT TUBE FASTENING
10 71420 HANDLE, CARRYING
11 16-71417 STUD, CLAMP BRACKET
12 13-26992 LOCKWASHER, (.250) Stainless Steel, CLAMP BRACKET STUD
13 11-29598 NUT, (.250-28) Stainless Steel, CLAMP BRACKET STUD
14 17-71418A2 PIN ASSEMBLY, Tilt Lock
15 24-62143 SPRING, TILT LOCK PIN
16 10-67982 BOLT, CLAMP BRACKET TO BOAT
17 12-67983 WASHER, CLAMP BRACKET SCREW
18 11-8267098 NUT, (.250-20), CLAMP BRACKET SCREW
▶CRANKSHAFT, PISTON AND CONNECTING ROD (14 parts) CRANKSHAFT, PISTON AND CONNECTING ROD
Ref OEM Part # Part Name
- 27-78139A80 GASKET SET
1 427-7334A2 CRANKSHAFT ASSEMBLY
2 79952A1 CARRIER ASSEMBLY
3 25-62704 O-RING, (.362 x .103)
4 28-20094 KEY, Woodruff, CRANKSHAFT
5 608-7395A2 CONNECTING ROD ASSEMBLY
6 10-87374 SCREW, (.250-28 x 1.030), CONNECTING ROD
7 29-26815 BEARING, Needle, CRANKPIN
8 11-20061 NUT, CONNECTING ROD SCREW
9 12-65967 WASHER, NEEDLE BEARING RETAINING
10 29-31505 BEARING, Needle, PISTON PIN
11 719-7391T3 PISTON ASSEMBLY
12 40-21666 LOCK RING, PISTON PIN
13 39-21665A12 RING SET, Piston
▶CYLINDER BLOCK AND CRANKCASE ASSEMBLY (41 parts) CYLINDER BLOCK AND CRANKCASE ASSEMBLY
Ref OEM Part # Part Name
- 87096A79 POWERHEAD ASSEMBLY
1 843-8694A3 CYLINDER BLOCK
2 16-66021 STUD
3 17-8M0084726 PIN, Dowel (.187 x .530), CRANKCASE TO CYLINDER BLOCK
4 22-89275 FITTING, BLEED DRAIN
5 32-9912688 TUBING, (36.00 Inches Bulk), BLEED DRAIN
6 54-68424 CLAMP, BLEED HOSE ATTACHING
7 22-887801 ELBOW, Tell-Tale Tubing, BLEED DRAIN
8 10-73280 SCREW, CRANKCASE TO CYLINDER BLOCK (1-1/2")
9 10-76621 SCREW, CRANKCASE TO CYLINDER BLOCK (1")
10 70726 REED BLOCK
11 34-35836 REED, INLET VALVE
12 34-22215 RETAINER, REED
13 10-28430 SCREW, (#6-32 x .25)
14 27-357391 GASKET, REED BLOCK TO CRANKCASE
15 30-72961 BEARING, Ball, CRANKCASE (LOWER)
16 26-56397 SEAL, Oil, CRANKCASE (LOWER)
17 15-31412A1 SHIM
18 1132-6352A1 HOUSING ASSEMBLY, Bearing, UPPER
19 30-72961 BEARING, Ball, UPPER BEARING HOUSING
20 31-31410 BEARING, Roller, UPPER BEARING HOUSING
21 26-66301 SEAL, Oil, UPPER BEARING HOUSING
22 25-20863 O-RING, UPPER BEARING HOUSING
23 54-34598 CLAMP, HOLD DOWN
24 10-36205 SCREW, (#10-24 x .563)
25 24-34731 SPRING, HOLD DOWN RING CLAMP
26 10-39002 SCREW (1/2")
27 35658 COVER, TRANSFER COVER
28 27-35657 GASKET, TRANSFER PORT COVER
29 10-20720 SCREW, (.190-24 x .62)
30 1016-7070A1 COVER ASSEMBLY, CYLINDER BLOCK
31 66019 MOUNT, RUBBER - COVER TO TOP COWL
32 13-20202 LOCKWASHER, RUBBER MOUNT
33 11-22053 NUT, (.312-24), RUBBER MOUNT TO COVER
34 27-416151 GASKET, COVER TO CYLINDER BLOCK
35 10-8M0214943 SCREW, (.250-20 x 1.00)
36 27-416141 GASKET, CYLINDER BLOCK TO BAFFLE PLATE
37 46234 PLATE, BAFFLE - EXHAUST MANIFOLD
38 27-416141 GASKET
39 46171 COVER, EXHAUST MANIFOLD
40 10-49668 SCREW, (.250-20 x .750)
▶DRIVESHAFT HOUSING ASSEMBLY (21 parts) DRIVESHAFT HOUSING ASSEMBLY
Ref OEM Part # Part Name
- 27-78139A80 GASKET SET
1 1542-8452A1 HOUSING ASSEMBLY, Driveshaft Comment: (LONG SHAFT)
2 16-66373 STUD, DRIVE SHAFT HOUSING TO GEAR HOUSING
3 11-82670911 NUT, (.312-24) Stainless Steel, DRIVE SHAFT HOUSING STUD
4 11-8M0204726 NUT, (.375-24), GEAR HOUSING STUD
5 1539-8450A1 SADDLE
6 64076 BUMPER, THRUST - SADDLE
7 79896A1 MOUNT, LOWER Comment: (LONG SHAFT)
8 79896A1 MOUNT, UPPER Comment: (LONG SHAFT)
9 53-26406 RING, UPPER AND LOWER MOUNT
10 79907 COVER, UPPER AND LOWER MOUNT
11 27-59079 GASKET
12 11-24652 NUT, (.250-28)
13 32-32077 TUBE, WATER OUTLET Comment: (LONG SHAFT)
14 26-36556 SEAL, (.500 Inch Outside Diameter), RUBBER - WATER OUTLET TUBE
15 23-13127 SPACER, NYLON - OUTLET TUBE SEAL
16 71057 LINK ROD, REVERSE LOCK
17 10-65414 SCREW
18 65216 CAM, REVERSE LOCK
19 72007 RETAINER, REVERSE LOCK CAM
20 93145 BLOCK, DRIVESHAFT Comment: (LONG SHAFT)
▶FLYWHEEL AND IGNITION COMPONENTS (44 parts) FLYWHEEL AND IGNITION COMPONENTS
Ref OEM Part # Part Name
1 236-4475A1 FLYWHEEL ASSEMBLY
2 12-36245 WASHER, FLYWHEEL NUT
3 11-20696 NUT, FLYWHEEL
4 13-35629 WASHER, WAVE-CAM TENSION
5 336-4465 CAM
6 336-4524A1 COVER ASSEMBLY
7 10-60491 SCREW, (#8-32 x .620), COVER TO MODULE
8 336-4516A2 IGNITION MODULE ASSEMBLY
9 10-59800 SCREW, MODULE TO STATOR (9/16")
10 10-36046 SCREW, MODULE-COIL LEAD (1/4")
11 10,13-26996 LOCKWASHER, Stainless Steel, MODUEL TERMINALS
12 10-32,11-45076 NUT, Brass, MODULE TERMINALS
13 336-4469A1 COIL ASSEMBLY Comment: LOW SPEED
14 54-59538 CLIP, COIL RETAINING
15 54-59539 CLIP, COIL RETAINING
16 336-4463 CONDENSER ASSEMBLY
17 10-62269 SCREW, (#10-32 x .437), CONDENSER ATTACHING
18 336-4476A6 STATOR ASSEMBLY
19 336-4458 PLATE, STATOR HOLD DOWN
20 10-35400 SCREW, HOLD DOWN PLATE TO STATOR (7/16")
21 15-33910015 SHIM, STATOR PLATE TO UPPER END CAP
22 336-3989 WICK, CAM WIPER
23 336-4318A2 MAKER ASSEMBLY, STATOR HOUSING
24 10-56266 SCREW, MAKER TO STATOR HOUSING (3/8")
25 56520 CAM
26 10-69054 SCREW, (.250-20 x .620), THROTTLE CAM TO CONTACT HOUSING
27 12-37998 WASHER, THROTTLE CAM ATTACHING SCREW
28 56757A5 WIRE ASSEMBLY, Jumper (BLACK-4-1/4")
29 56318A11 LEAD ASSEMBLY (GREEN-12-1/4")
30 38938 BOOT, LEAD ASSEMBLY
31 56316A4 CABLE ASSEMBLY, STATOR HOUSING (WHITE-103/4")
32 38938 BOOT, CABLE
33 336-4460 INSULATOR, CABLE TO CONTACT HOUSING
34 11-56325 NUT, CABLE INSULATOR
35 336-4528T2 COIL ASSEMBLY, Ignition
36 10,13-26996 LOCKWASHER, Stainless Steel, IGNITION COIL TERMINAL
37 10-32,11-45076 NUT, Brass, IGNITION COIL TERMINAL
38 66355 COVER
39 10-61530 SCREW
40 10-32,11-27164 NUT AND LOCKWASHER, , COIL COVER SCREW
41 84-813715A1 LEAD ASSEMBLY, HIGH TENSION
42 332-2854T01 BOOT, IGNITION COIL
43 85-63709A1 BOOT/TERMINAL KIT, SPARK PLUG
44 33-14103Q SPARK PLUG Comment: CANADA AND BELGIUM
▶FUEL PUMP AND FUEL LINES (16 parts) FUEL PUMP AND FUEL LINES
Ref OEM Part # Part Name
- 27-78139A80 GASKET SET
1 89977A1 PUMP ASSEMBLY, Fuel
2 32-8M0108355 LINE, (57.00 Inches Bulk)
3 54-68424 CLAMP, FUEL LINE
4 22-19688 FITTING, FUEL LINE TO CARBURETOR
5 22-98750 FITTING, FUEL LINE TO ADAPTOR
6 32-9912878 TUBING, FUEL PUMP TO CYLINDER BLOCK
7 22-33373001 ELBOW, HOSE TO CYLINDER BLOCK (90 DEGREE)
8 54-68424 CLAMP, FUEL PUMP HOSE TO ELBOWS
9 30188 WASHER, ADAPTOR
10 24-23067T SPRING, ADAPTOR STEM
11 25-16524 O-RING, ADAPTOR STEM
12 23069 STEM, CHECK UNIT ADAPTOR
13 22833 ADAPTOR, CHECK UNIT
14 10-37923 SCREW, (.250-28 x 1.250)
15 11-24652 NUT, (.250-28), ADAPTOR SCREW
▶GEAR HOUSING(DRIVESHAFT) (34 parts) GEAR HOUSING(DRIVESHAFT)
Ref OEM Part # Part Name
- 26-77066A1 SEAL KIT, Water Pump
1 1630-7360A11 GEAR HOUSING ASSEMBLY
2 16-58138 STUD, GEAR HOUSING (3-1/2")
3 16-58136 STUD, WATER PUMP HOUSING (2-3/4")
4 31-22756 BEARING, Roller, DRIVE SHAFT
5 17-20032 PIN, Dowel, LOCATING
6 26-33613 SEAL, RUBBER - WATER INTAKE TUBE
7 23-86215 BEARING, NYLON - INTAKE TUBE SEAL
8 35-33425 SCREEN, WATER INTAKE
9 10-25612 SCREW, WATER INTAKE SCREEN
10 43-98696 GEAR, Pinion
11 14-30377 TAB WASHER, PINION GEAR SCREW
12 10-30376 SCREW, (#12-28 x .750), PINION GEAR TO DRIVE SHAFT
13 45-95874A1 DRIVESHAFT Comment: (LONG SHAFT)(USE WITH 47-89980 IMPELLER)
14 15-30527A1 SHIM ASSEMBLY, BALL BEARING (.002-3-5-10)
15 30-70944 BEARING, Ball, DRIVE SHAFT
16 53-30523 RING, Retaining, BALL BEARING
17 15-30527A1 SHIM ASSEMBLY, BALL BEARING (.002-3-5-10)
18 46-92970A1 HOUSING ASSEMBLY, Water Pump Comment: (USE WITH 47-89980 IMPELLER)
19 25-29439 O-RING
20 26-897153 SEAL, Oil Comment: (USE WITH 47-89980 IMPELLER)
21 70977T INSERT
22 26-33613 SEAL, WATER INTAKE TUBE
23 32-34293 TUBE, WATER INTAKE
24 28-8M0032835 KEY, IMPELLER DRIVE
25 47-89980 IMPELLER Comment: (MOLDED 47-89980 - .438 I.D.)
26 46895 FACE PLATE, WATER PUMP
27 93224A1 COVER ASSEMBLY, Water Pump
28 26-36558 SEAL, WATER PUMP COVER
30 26-30913 SEAL, Oil, WATER PUMP COVER
31 12-20533 WASHER
32 11-8267119 NUT, (.250-28), WATER PUMP HOUSING STUD
33 25-30526 RING, RUBBER - CENTRIFUGAL SLINGER
34 23-31792T SLEEVE, GUIDE - INLET TUBE
▶GEAR HOUSING(PROPELLER SHAFT) (36 parts) GEAR HOUSING(PROPELLER SHAFT)
Ref OEM Part # Part Name
- 27-78139A80 GASKET SET
1 1630-7360A11 GEAR HOUSING ASSEMBLY
36 10-79953Q04 SCREW, (.375-16 x .250), GREASE FILLER HOLE
37 12-191833 WASHER, GREASE FILLER HOLE SCREW
38 10-28653 SCREW, (#10-32 x 0.25), GREASE VENT HOLE
39 19643 WASHER, GREASE VENT HOLE SCREW
40 71658A1 SHIFT SHAFT ASSEMBLY, SHIFT Comment: (LONG SHAFT)
41 53-22899 RING, Retaining, SHIFT SHAFT
42 23-30676A1 BUSHING ASSEMBLY, SHIFT SHAFT
43 25-26802 O-RING, (.424 x .103), SHIFT SHAFT BUSHING
44 26-30696 SEAL, Oil, SHIFT SHAFT BUSHING
45 10-39149 SCREW, (#10-24 x .500)
46 44434 CAM
47 15-30522A1 SHIM ASSEMBLY (.002-3-5-10)
48 30-21889 BEARING, Ball, FORWARD GEAR
49 43-48577A3 GEAR ASSEMBLY, Forward
50 31-22458 BEARING, Roller, FORWARD GEAR
51 52-63314 RATCHET, SLIDING CLUTCH
52 17-30535 PIN, Cross, RATCHET TO PROPELLER SHAFT
53 53-32449 RING, Retaining, CROSS PIN
54 31334 FOLLOWER
55 24-76298 SPRING, COMPRESSION - CAM FOLLOWER
56 44-75667A2 PROELLER SHAFT ASSEMBLY
57 43-63316 GEAR, Reverse
58 71479 SLEEVE, THRUST - REVERSE GEAR
59 15-30532A1 SHIM ASSEMBLY (.002-3-5-10)
60 30-21889 BEARING, Ball, REVERSE GEAR
61 25-30529 O-RING, (1.925 x .103), BEARING CARRIER
62 72673T1 CARRIER ASSEMBLY, Bearing
63 31-22458 BEARING, Roller, BEARING CARRIER
64 26-66022 SEAL, Oil, BEARING CARRIER
65 86236 COVER, GEAR HOUSING
66 86665A1 COLLAR, PROPELLER
67 48-63494A10 PROPELLER ASSEMBLY Comment: (2 BLADE ALUMINUM - 6" PITCH)
68 11-64075A1 SPACER, SPLINED - PROPELLER NUT
69 11-64075A1 NUT
▶MISCELLANEOUS PARTS/ACCESSORIES (1 parts) MISCELLANEOUS PARTS/ACCESSORIES
Ref OEM Part # Part Name
- 37-86667A86 DECAL SET Comment: (SAILPOWER)
▶SHIFT CONTROL LINKAGE (16 parts) SHIFT CONTROL LINKAGE
Ref OEM Part # Part Name
1 93730T HANDLE, SHIFT CONTROL
2 66378 SHAFT, CONTROL HANDLE
3 23-66375 BUSHING, NYLON - SHIFT CONTROL HANDLE
4 66414 CAM, SHIFT SHAFT
5 43-66377 SECTOR GEAR, SHIFT CONTROL HANDLE
6 12-8M0204649 WASHER, (.281 x .500 x .060) Stainless Steel
7 11-826709109 NUT
8 17-25905 PIN, DETENT CAM TO SHIFT SHAFT
9 12-8M0204649 WASHER, (.281 x .500 x .060) Stainless Steel
10 11-8267089 NUT, (.250-28)
11 24-39627 SPRING, DETENT - CRANKCASE
12 39601 PLATE, DETENT SPRING
13 10-25764 SCREW, (.190-32 x .50)
14 71660 SHIFT SHAFT, UPPER
15 23-30677 BUSHING, NYLON - SHIFT CONTROL SHAFT
16 43-86686A1 SECTOR GEAR, SHIFT SHAFT
▶STEERING HANDLE ASSEMBLY (20 parts) STEERING HANDLE ASSEMBLY
Ref OEM Part # Part Name
- 60850A6 HANDLE ASSEMBLY, Steering, COMPLETE
1 60854 GRIP, HANDLE - THROTTLE
2 62251 CAP, HANDLE THROTTLE
3 66393 SHAFT
4 66394A1 HANDLE ASSEMBLY, THROTTLE SHAFT
5 17-46152 PIN, THROTTLE HANDLE
6 12-62252 WASHER, THROTTLE HANDLE TO STEERING ARM
7 60850 ARM, STEERING HANDLE
8 43-60852 GEAR, THROTTLE SHAFT
9 17-27088 PIN, BALL GEAR TO THROTTLE SHAFT
10 48003 PIVOT, STEEIRNG HANDLE TO BRACKET
11 15-48002015 SHIM, HANDLE PIVOT TO BRACKET (.015)
12 10-96138 SCREW, (.250-28 x .620), HANDLE TO ARM BRACKET
13 60857A2 UNIVERSAL JOINT ASSEMBLY
14 43-60852 GEAR, UNIVERSAL JOINT
15 17-27088 PIN, BALL GEAR TO UNIVERSAL JOINT
16 96130A1 BRACKET, STEERING ARM
17 10-62233 SCREW, (#10-16 x .625), DETENT SPRING TO BRACKET
18 24-72847 SPRING, DETENT - STEERING HANDLE
19 12-30164 WASHER, (.192 x .375 x .0312) Stainless Steel, DETENT SPRING SCREW
▶SWIVEL BRACKET ASSEMBLY (29 parts) SWIVEL BRACKET ASSEMBLY
Ref OEM Part # Part Name
1 1471-7324A1 SWIVEL BRACKET ASSEMBLY
2 22-8M0169589 FITTING, Grease, SWIVEL BRACKET
3 23-64028 BUSHING, SWIVEL BRACKET
4 77334 PLATE, CO-PILOT
5 10-78038 SCREW, (.250-20 x 1.75), CO-PILOT DISC TO SADDLE
6 72845A1 PLATE ASSEMBLY, CLAMP - CO-PILOT
7 20203 DISC, FRICTION
8 10-36154 SCREW, (.250-28 x 1.380), CLAMP PLATE ADJUSTING
9 12-35462 WASHER, (.2656 x .625 x .0625) Stainless Steel
10 17-25319 PIN, (.125 x 0.75 Inches), SPRING GUIDE
11 87984A1 LEVER ASSEMBLY, TILT STOP
12 10-41433 SCREW, (.250-28 x 1.00), TILT STOP LEVER
13 13-31030 WAVE WASHER, LEVER ANCHOR SCREW
14 11-35888 NUT, (.250-28) Stainless Steel, TILT STOP LEVER SCREW
15 72794 STOP, REVERSE LOCK
16 10-71056 SCREW, (.250-28 x .560), REVERSE STOP TO SWIVEL BRACKET
17 13-26992 LOCKWASHER, (.250) Stainless Steel, REVERSE STOP SCREW
18 12-71055 WASHER, REVERSE STOP SCREW
19 63554 GUIDE, SPRING
20 79744 LEVER, CONTROL - TROLL BRACKET
21 13-63631 WAVE WASHER, TROLL BRACKET LEVER
22 71419 ROD, REVERSE LOCK TO SWITCH BRACKET
23 23-26841 BUSHING, NYLON - REVERSE LOCK LEVER ROD
24 18-45882 COTTER PIN, REVERSE LOCK LEVER TO ROD
25 63628T LEVER, REVERSE LOCK
26 61007 RETAINER, ROD - REVERSE LOCK
27 63559T BRACKET, TROLL
28 24-63630 SPRING, EXTENSION - TROLL BRACKET
29 66559 TUBE, SWIVEL BRACKET TO SADDLE
▶THROTTLE CONTROL LINKAGE (15 parts) THROTTLE CONTROL LINKAGE
Ref OEM Part # Part Name
1 43-60856 GEAR, THROTTLE CONTROL
2 60885T HOUSING, HORIZONTAL GEAR
3 10-96138 SCREW, (1/4-28 x 5/8)
4 15-64653A1 SHIM ASSEMBLY, PINION GEAR TO BOTTOM COWL
5 42666A3 GEAR AND SHAFT ASSEMBLY
6 62099T BRACKET, THROTTLE CONTROL LEVER
7 10-23015 SCREW, (.190-32 x 1.00), ADJUSTING - THROTTLE
8 10-32,11-68219 NUT, Stainless Steel
9 17-69745 PIN, Roll, LEVER TO VERTICAL SHAFT
10 60920 LINK, THROTTLE LEVER TO STATOR PLATE
11 10-34696 SCREW, (#8-32 x .750)
12 12-34392 WASHER
13 13-29720 WAVE WASHER
14 11-28656 NUT
15 10-56027 SCREW
▶TOP COWL AND STARTER ASSEMBLY (33 parts) TOP COWL AND STARTER ASSEMBLY
Ref OEM Part # Part Name
1 191-7668A2 TOP COWL ASSEMBLY
2 39538 STRIP, SOUND SEAL-REAR
3 39537 STRIP, SOUND SEAL-FORWARD
4 66018 MOUNT, RUBBER-TOP COWL
5 89096 TRIM COVER, TOP COWL
6 10-64652 SCREW, TRIM COVER TO TOP COWL
7 14-20165 TAB WASHER, SHEAVE SHAFT NUT
8 11-20166 NUT, SHEAVE SHAFT (LEFT HAND THREAD)
9 64601 COVER, VENT-TOP COWL
10 10-35519 SCREW, (#10-16 x .500), VENT SCREEN TO TOP COWL
11 39258 BRACKET, TOP COWL FASTENING Comment: (STARBOARD)
12 10-39514 SCREW, BRACKET TO TOP COWL (1-1/8")
13 12-39143 WASHER, (.253 x .625 x .0937), BRACKET SCREW
14 20155 RETAINER, STARTER SPRING
15 24-29340T02 SPRING, STARTER REWIND
16 23-28912 BUSHING, SPRING GUIDE
17 50-93696A2 SHEAVE ASSEMBLY, Starter
18 17-22896 PIN, RETAINER, STARTER CABLE
19 30596 PAWL, STARTER
20 13-36206 WAVE WASHER, STARTER PAWL
21 23-28919 BUSHING, NYLON-SHEAVE SHAFT SPACER
22 23-61005 SPACER, SHEAVE SHAFT
23 26179 RETAINER, SHEAVE SHAFT TO STARTER SHEAVE
24 12-35559 WASHER, SHEAVE SHAFT RETAINER
25 13-20160 WAVE WASHER, RETAINER TENSION
26 30595 PLATE, RETAINER-STARTER PAWL
27 35558 SHAFT, Sheave
28 93695 PULLEY, STARTER CABLE
29 23-309772 SPACER, CALBE PULLEY
30 12-22887 WASHER, PULLEY FASTENING SCREW
31 10-28789 SCREW, (.190-24 x .750), PULLEY TO TOP COWL
32 50-12066Q10 ROPE
33 79470A1 RETAINER KIT, Rope

100-Hour / Annual Service Checklist

Regular maintenance keeps your Mercury 4.5 (1 CYL.) running reliably season after season. Most of these tasks can be performed with basic tools and the factory service manual.

  1. Replace water pump impeller and inspect wear plate
  2. Change engine oil and oil filter (check drain plug washer)
  3. Replace spark plugs and check ignition timing
  4. Drain and refill lower unit gear oil; inspect for water contamination
  5. Inspect fuel lines, primer bulb, and fuel filter for deterioration
  6. Check and replace sacrificial anodes (zinc or aluminum)
  7. Inspect propeller for damage; check shaft seal and cotter pin
  8. Check valve clearance (refer to service manual for specifications)
  9. Lubricate all grease points (steering, tilt tube, shift linkage)
  10. Inspect control cables and throttle/shift linkage for smooth operation
  • Pro Tip: Always flush the engine with fresh water after saltwater use — even a quick 10-minute flush significantly extends component life.
  • Pro Tip: Use fuel stabilizer in the tank before winter storage, and fog the cylinders to prevent internal corrosion during extended periods of non-use.

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